Timer



July 8? 192 2;

A. W. KAUFMAN TIMER Filed March 7, 1922 Patented July 8, 1924. I v V UNITED STATES PATENT OFFICE.

ADAM W. KAUFMAN, O'F MILWAUKEE, Wisconsin.

I TTMER'.

' Application filed March 7, 1922. Serial No. 541,678;

To all whom it may concern: yoke is formed with inwardly extending end Be it known that I, ADAM lV. KAUFMAN, portions .10 which are offset towards each a citizen of the United States, and resident other, as shown at 11, and provided with of Milwaukee, in the county of Milwaukee transversely disposed heads 12. An in- 60 and State of Hsconsin, have invented cerwardly bowed shoe 13 is slidably mounted tain new and useful Improvements in upon the arms of the yoke and is provided Timers; and I do hereby declare thatthe folwith lugs 14 at each end of which en 'age lowing is a full, clear, and exact description the sides of the arms 11 and the heads 12, thereof. and the shoe is normally held in this posi- 65 My invention relates to a new and imtion by means of a coil spring 15. The proved timer for use in connection with shoe may be easily removed from the yoke internal combustion engines. or replaced by depressing the same in op- The general object of the invention is to position to the spring 15, so that the lugs 14 provide means, whereby a smooth and unimay be slipped laterally underneath the 7 form contact may be effected with the least offset portions 11 of the yoke arms.

possible wear and friction upon the 0011- The rotor 16, which is preferably made tacting elements. by die casting, is secured to the shaft 6,

A more specific object of the invention and is provided with outwardly extending is to provide means whereby one or both parallel arms 17, the op )osed faces of which 2 of the contacting elements has a yieldable are provided with L siaped slots 18, the and floating connection with its support, inner laterally extending portions 19 of so that a full contact may be made between the slots being for the purpose of inserting the same with the least possible amount of a removable contact element 20. This confriction. tact element has its intermediate portion 2 A further object of the invention is to outwardly bowed so as to make a uniform provide means whereby the contacting elewiping contact with the shoe 13, and is proments may be conveniently renewed at comvided with inwardly extending legs 21, paratively slight expense whenever the surwhich terminate in the feet 22, which are face thereof becomes worn or irregular. slidably engaged in the slots 18. A coil 30 With the above and other objects in view, spring 23 yieldingly supports the contact the invention consists in certain details of element 20 normally in its outermost posiconstruction and combinations thereof, tion.

which will be more particularly described In the operation of my invention, the con in connection with the accompanying drawt ct elem n 01 br sh 2 i rri S S- ing and subsequently claimed. sively into contact with the several shoes In the drawing, 13, first engaging the same near one end Figure 1 represents a plan view of my inwith a smooth wiping Contact, while the vention with a portion broken away in springs 15 and 23 permit the adjacent ends order to show the interior construction. of the contact elements to yield slightly.

40 Figure 2 represents a vertical sectional As the rotor advances, the floating nature view thereof. of the contacting elements allows the same Figures 3 and 4 represent detail views to gradually change their positions with taken on the lines 3-3 and respecrelation to each other, so as form at all tively of Figure 1. times, a smooth and uniform contact. Al-

45 Referring more specifically to the drawthough a full contact is made, the friction ings, the numeral 5 designates the outer is, by means of this structure, reduced to a shell of the timer, and 6 designates a rotary minimum. In case, however, the contactshaft mounted centrally thereof. The shell ing elements become Worn or their surface 5 is provided with a plurality of binding irregular, the same may be replaced at a 50 posts 7, which are suitably insulated, one trifling cost.

binding post being provided for each While I have shown and described both cylinder of the engine. The binding posts contacting elements as having a floating are disposed radially and each is provided support, it will be seen that very good reat its inner end with a retaining head 8, sults may. be obtained if only one of them 55 which secures a metallic yoke 9, which may has a floating support.

be conveniently formed by stamping. This It will also be appreciated that various modifications may be made'in the structural 1. A timer comprising a plurality. of

radially disposed binding posts, each having a yoke secured to its inner end, an inwardly bowed contact member slidably mounted in said yoke, and yieldably held in its innermost position, and a rotor having a brush adapted to wipe the contact membersxsuce cessively.

2. A timer comprising a plurality of binding posts, disposed radially and each having a yoke secured to its inner end, said yoke having inwardly extending arms form ed with stops at their inner ends, a contact member rcmovably and slidably mounted on the arms of the yoke, a spring normally holding the contact member against the stops, and a rotor having a yieldable brush adapted to wipe the contact members successively.

In testimony that claim the foregoing i I have hereunto set my hand at Milwaukee, in the county of Milwaukee and'State of Wisconsin.

ADAM W. KAUFMAN. 

